Failed Nct High Emmissions

[gerald francis]

My 1994 ST 202 failed the Nct on high emmissions, low idle CO 3.65,lamda 0.877,high idle 3050rpm CO 4.41,HC 153.

I added Dipetane to the fuel and took the car back 4 days later with the following results Low Idle CO 2.45,Lamda 0.902,High idle (3150 rpm) CO 3.57,HC 183.

I have since taken the car to someone who put it on a Ethos Machine that said the Oxygen Sensor is faulty.

Can anyone tell me if this sounds correct before I go and buy an oxygen sensor also can anyone confirm if this model has one or two sensors and if 2 which sensor is it likely be.

Thanks for any info forthcoming

[GTForbes]

sounds about right mate, should just have one right after the exhaust manifold pre-cat, the post cat sensor is a temp sensor

[gerald francis]

Thanks very much for that mate, I know exactly where it is, very easy to get at.

Thanks again